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K G. D. BANCROFT. MACHINEFOR WINDING SPIRAL srnnws.

Patented April 4, 1876.

' Fig.2

WITN'EEEEE and a set of sliding and revolving jaws hung length, the jaws relieve the wire, and the ar- 2 is an elevation of the same.

' vice.

enters the wire-guide O at the opening (1, and

, key and keyway, so that, though the arbor chosen n. emo ions or nine, MASSACHUSETTS, ASSIGNOR or ownninir nrs men-r 1T0 NATHAN w. lenses, on sans PLACE.-

Specification forming part of Letters Patent No. l'iSJiSJ, dated April 4, 1876 application filed October 19, 1875.

To all whom it may concern:

Be it known that l, GEORGE E). Bnnonon'r, of Lynn, in the county of Essex and State of Massachusetts, have invented an 1m provement in lliachines for finding Spiral Springs, of which the following is a specification The nature of my invention consists in combining with a wire-guide a loose mandrel upon ahollow arbor, said. arbor being made to revolve by power, thus forming the spring, which action causes the arbor to retreat as the spring is formed. The spiral spring pressing through the center of the arbor, when the arbor has pressed back its whole her is sent forward by hand. Also, in combining with above a cutting-oil device.

- Figure 1 is a plan of my invention. Fig. 3 is a horizontal section of the same. Fig. 4. is an end elevation, showing the cutting-oil dc- 5 is a vertical section, enlarged, showing the wireguide. Fig. 6 is an elevation of the wire-guide.

Let A represent the frame or base of the machine; B, "the sliding mandrel upon which the wire is wound to form the spiral spring. lhis mandrel B slides freely through the wire-guide H Figs. 1 and 2, is a slide attached to the lever K. The mandrel B passes through the bent end of this slide, as shown at B, and is free to revolve; but ing provided with a head at B, it must tollow the slide when it is moved forward by the hand-lever K The wire (1, Figs. 3and 6,

is directed onto th e xnandrelvB by the. gagepiece 1)., The positionand thickness of the gagepiece D govern the openness of the spring. E is a hollow arbor, which is made to revolve by a pulley, F, attached to it by is free to slide back and forth in the pulley, it must always revolve with it. L and L are toggle-jaws, attached to the arbor E by the cross-head L Each of the jaws has attached to it a steady-boss, Z, Figs. land 2, which is acted "upon by spring, S, arranged to hold the jaw away from the spiral spring on the mandrel while the jaws are being inoved forward. or and m. are short sliding pins placed just back of the jaws L U, as shown in Figs. land 3,.so arranged that when the arbor is thrown'back, as in Fig. 2, the pins in m will strike the housing h and be forced forward against the .jaws L L, thus throwing them open, as indicated in Fig. 2, and relieving the K, Fig. 1, is a fixed arm,

spiral and mandrel. to which the lever K is attached by the link K. This lever K is connected to the arbor E by a sleeve, H, and stem E, Fig. 2, so that by moving the lever the arbor may be pushed forward.

The device for cutting oil the spirals'is shown at Fig. 4, and consists of the upright a short spiral, which is then placed in the guide-piece C, which is removed from the machine, so that this may be done; then the guidepiece 0 is replacedand the mandrel inserted,

as shown in Figs. 1 and 2, the spiral being long enough to project beyond the guide-piece G, as shown. Now, the arbor E is pushed forward until the jaws L L are inade to clamp the spiral, as they will by coming in contact with the face of the piece 0. The revolving" motion imported to the arbor and jaws will be transmitted to the mandrel and spiral, and the spring" or spiral rapidly .forined. As the spiral forms it will crowd the arbor and jaws back,v which action will continue untilthe small pins m m, Figs. 1 and 2, come in contact with the housingli"; then the jaws L L will be thrown out and the spiral released, as shown in Fig.

2. This completes the operation, and the an bor may be pushed back again to repeatthe npemtisn. i"

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